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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15222) Use less contended classes for metrics
Date Tue, 23 Feb 2016 00:14:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15157996#comment-15157996
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Elliott Clark commented on HBASE-15222:
---------------------------------------

Even on a more beefy server with 32 cores the trend seems to be the same.
{code}

Benchmark                                      Mode        Cnt      Score    Error  Units
HistogramBenchmark.fastLong                  sample   35227492   3567.574 ± 62.455  ns/op
HistogramBenchmark.testHDRAtomic             sample   66502547   7451.278 ± 27.255  ns/op
HistogramBenchmark.testHDRConcurrent         sample   44092577   6178.153 ± 24.280  ns/op
HistogramBenchmark.testMutableTimeHistogram  sample   59723205   3207.766 ± 17.421  ns/op
HistogramBenchmark.testYammer                sample   55265767  14979.696 ± 42.628  ns/op

{code}

> Use less contended classes for metrics
> --------------------------------------
>
>                 Key: HBASE-15222
>                 URL: https://issues.apache.org/jira/browse/HBASE-15222
>             Project: HBase
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 2.0.0, 1.2.0, 1.3.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>            Priority: Critical
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: HBASE-15222-v1.patch, HBASE-15222-v10.patch, HBASE-15222-v11.patch,
HBASE-15222-v2.patch, HBASE-15222-v3.patch, HBASE-15222-v5.patch, HBASE-15222-v6.patch, HBASE-15222-v8.patch,
HBASE-15222-v9.patch, HBASE-15222.patch
>
>
> Running the benchmarks now, but it looks like the results are pretty extreme. The locking
in our histograms is pretty extreme.



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